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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65eeefb80c8a17a1e7dcce02a1f29d92eb36268b157b6aae71db269dcbeff104' 
  AND token = '0VN2svIEhf6ir7LT3ZSP0rO/y41gbx3i7Dta2pY1Z74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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