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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2e187eea75797519155d86b95904db0db9cc2d2c186d7730369e6f93a72773' 
  AND token = '2HH3n0sXPf3vYG35HkaWaf8RRt3Ab9quc2yGCj/VyPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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