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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0aac4561a0bdfcc7d40056f4e082f6cfc118b10aecad7b028234bd132ca98c' 
  AND token = '1PiNrFiNfgGFXx+PL9JG0MNJAzAHbzVc8DXg2hEa/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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