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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db128bc543be085cbaabfb7d8c5159b31a15510f1fa401c570b210bd8bd9e86a' 
  AND token = 'Uz/TygdgOaoe/fbILYzavHKv3gzPBDDqFv04ym3DS6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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