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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aabcb0b34435c3fc809bbd7baba942ec8b0d03ebcc1d9ef7d54b61ca5f9183' 
  AND token = '8RfYzG5FKwNKLUWFV+3/7Hmwlbm1AMw5bRdMHS50tn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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