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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc1ad876ffaa1d8e7a954ad8b9f4286fe80983565f7983849829c259ff7909e' 
  AND token = 'qlZbDM0POFluGTxFaWb4MU6IENvfkhunZSTyzz1J0Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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