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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f361f888d0b10f6bfed1691242147a3beae624bdcb8a2f99d0dd4afa60d6d6e7' 
  AND token = 'DMy4UlI2gQDLeEBQy5DhZC9olSkBtfXnDmy8Vo/XCek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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