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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421413450db709a40d1a0ca1e214a97966c8be38cb49c581ef1081f5ddacc5f0' 
  AND token = 'OthxQjvBtdcXkwI0cEQF6ugOMY/QD2A8NxlPcjgAuIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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