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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dc091421c452c93b64b4af315e66d5f23be6f7657a1d8c79a5532af4f8e92a' 
  AND token = 'bl252mz6so9f1k14dwaNh3B+CNM+bv6OhpPPEo9isbs=' 
  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"
    }
  }
}