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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2b38a82adb0be49be391d1f517e7b379d2de02d6e9d03e71f453e82ba60cbb' 
  AND token = 'r3R2/oOcF8FfJGq+6l2CJ4QWJNpjMHF7FsgC2J18F/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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