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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a40a60bf6842dd65413f70ce05d10e3b84402a988bc7238673f4195ceaee999' 
  AND token = 'k/142R1OidM1zdTAe1nber6MxLC/Ky2OuBcL2W2O6qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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