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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b5f9ddeac6ac94f922538c3b86bf00d892c8ec96df8243300db4e68cf619e0' 
  AND token = 'p2QBXMZWue7IhBn1R53ECl/HgPbkct44+1puz5uXzhU=' 
  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"
    }
  }
}