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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0503ee44b53e96286061af013b2991069487e7462c403f43e174e309ff9163' 
  AND token = 'Aov2bXSo32B9N6HtoSoCjB0a5YM+NvwTtjFCeI8KEMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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