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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deaad6091a2130dd9a2aee872d6c474e369d1caef1a049ce62315d559d537813' 
  AND token = '8Oy6CaD0w218u6Gu0HYj9cuBqvspNBtkl0wWcf6Sdpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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