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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96855f7d2a1d030f19ad2ff313772767aafb0c01ef1f4bef93e04217bcfb1b3b' 
  AND token = '0VFzlSEDC4gnHs1okw0/P5mBUMoIMAbaKL+wfH5x0Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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