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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435a709f1d84194ec8c5e42d85836354de9505ec4aa94f1d0534c9bc8adf7d46' 
  AND token = 'ltEUQv2bKhfjf5VeHYTTb/iizx3c6OqbowbC0aKiqH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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