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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4050463567ca7920f6201e4f1039b5421263ff409fdeaddf3f72ab870325e76c' 
  AND token = 'QHW5rShsHbye8NMpFxCVeIH7XL97RLClk1Ok+vSAaSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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