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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ed60eef4bbad95e69de4c9fbe639d70c68c28935c1d435eca9481b55d83a9d' 
  AND token = 'Ddxl08JsSB9crnpi21Qs2Yz6Rk6m6nMm5yqL+3Z5R7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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