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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d0ec6656188c900d8d564d4318ed54d8828d3424ac3547ab7a4a8285b7870d' 
  AND token = '+uVOOfVGTKmrTb99J/J5rEWxEXw3lwjK/O0jaePK4lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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