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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9b38ca7995f8acd78c4c5caf93c08399776da705fce29249021469c3497226' 
  AND token = '9uo3L2hUf2bMc3vUjh0TeYB4KZO4Y3vbxpWpMRbk3QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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