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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17eae707cc02880b6fd5eacfb0eb9a4de68d2961454ac19d013f44a2a1e82133' 
  AND token = '+8WxKgNSUpB/ZKI7dzZ/WS1c/t6E3ozc8PiGsLVlud4=' 
  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"
    }
  }
}