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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd0f81968d6b1e6c7106e5c551391b775e97f308632d9a9d40738405e1253b7' 
  AND token = 'nJcQRj3dP1DXcjjHkpSV2pC3dtTNcqJ66Yn1/tNk+X8=' 
  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"
    }
  }
}