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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7966f91388df6143e7ab762721fad8e2733b770f55d378eed1b7dd3efe54e625' 
  AND token = '+YRg6jthhrdRfcT/O1BNzxkzefE5zwpBXPkXCFdJSbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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