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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9debce50af97ec3fe47641dba2697c4cac86fa7ba8de4c73914b35b47f654e78' 
  AND token = 'JX+pXsnx+1JKSN0+oQJg1vfkvogdvVTW2AEJv6ElL0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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