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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3d2c8bd76e0cd1a8788db5d753aec6a2d7180d1bcf6d54a039d15db8beb5ca' 
  AND token = 'Y3EAT+BtZzycQjpfODCLBYUV48OUw1Jisa21yyeIhIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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