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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c1795bf7b50b12cedaecfbd225c6ad9f1bcfcbb7d97bd24821aaf7aadd9d22' 
  AND token = 'YI8qm/92Gh3x8L/hZFYK13i6Qmd6u0Q3idAURDI2ZYg=' 
  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"
    }
  }
}