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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6851ad99f1673315470902732e4edf7d829590d9358b16d6e7558a03a7b4a9' 
  AND token = 'EJvjop6ZM3aPFS4ZsCjmFB469zU5HvWdi9MEwqZJ4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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