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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06efefc26644221e065724ac008a0c98b33ff2901a486487f5fad6d7fdfc760e' 
  AND token = 'FwKCs2fA0AJgw+S8xvm/Q0vq4FPUMT8kX3a2Jimy6bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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