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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657e94e509a09c096730cc0c7f33f6d14a2e349d6b2f993c932955f860cf7a01' 
  AND token = 'H05YV5fQZAsFwHfp2K/9ytVmaV4/3dRV7Y/SpsHGEtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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