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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7d5295151b3bc6c663b8398791d33b3ae81a7c608fe521df1995be99752e55' 
  AND token = 'gfpK8/+04v++rsE2tosd1/MHxQcykfnAwWoDnv3p72s=' 
  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"
    }
  }
}