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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb9e2032a5fa13a6ce1e40d117979a2108de62db1e2abf75da20431f8a0d4f2' 
  AND token = '7s2WWELaJhg/eowcDZ/u0K9pXv1ygs+1/aq4g2hsXrg=' 
  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"
    }
  }
}