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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3037010c1f4f314e84c9aee5ee166c32fc26e410cf26445b3f5532daa5223cc4' 
  AND token = 'cKIHDOeTPeR/xXcR+15SgSggW1EiG9TLg6c/f+YLNMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}