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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e222dd2d27fa3318ae89fee1b8c02462eaf713cbbb7f5e3f77373db4f9b392a1' 
  AND token = 'bYKgXESCfof4o/ZfKtlbYhV+n5gKIOm2J2gWsKkYVco=' 
  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"
    }
  }
}