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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5dc6b76e60af602e001615386ce8e0a8d740c52e37c0a84fcd6c954136af1fb' 
  AND token = '0bit8whOca6E893yLPc6y3bnz7zOlzlnDpa6SK8cO98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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