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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319ea67181d79d94d5726608f72dccd2d670717cba19614af5feb0c4dadbd33e' 
  AND token = '272iXX0s6Pr+/EYO0VGT9oXjb3rIMB+p2wCi1f14LWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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