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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47434e8f8d8a3eb793839d987d3e1076a5d4f144c13bf4a9e125704bf4eb0bcf' 
  AND token = 'oWYp2lT8QngDw7WoWSrA5aiZv71U5yh9lnm7Gp5C1bk=' 
  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"
    }
  }
}