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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f66399ca2d08c4583780df0baf063dee8cd11ae2d9d642ac9feb02e2825d18d' 
  AND token = 'dPEC++ZT4rJfML0pk0L5Gx9FCg38QAk9wFpZvTFWR5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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