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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9eac98dcf1d9390c5b21d967d76d6c96224197185e83bee3236ba6018e432b8' 
  AND token = 'Xpnd+JjGVQU5S++3b7wgAPceM3Aab2VkV8jBLrkOsak=' 
  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"
    }
  }
}