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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4696186eb4c3f31df442e7144795a54bb138ca20d232cc5d875b8569bb5e3a' 
  AND token = '3NjgUMEzeemzy2pH9w4iFuriGu7i0ek5WLgfTD4N4R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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