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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6c5c90b724f7961f05fdfb98432a3d8405408bafb250c2d4d16d8239d2cee3' 
  AND token = 'vkkI0LvzO+WWi1O9jqPDRr8ELxvx5tT4Ut55dD6X4Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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