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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4c147de01c8c1e188873338c0ea6a47b8efcf90b65eef919290291f2d37757' 
  AND token = 'I0ZxiL4Olb69Oal4LO8vx44H0Bcj5AC1hxsQKL1XZZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}