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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afb7f6942cbc1e4f2426da63c7d0340f550c5b5558078a3ec0273009bb5bcb2' 
  AND token = 'WPCNCSmPBSX0P7SK9NusWvnZOD1EAtkNF63uQ8yNxfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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