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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0176a027c96dff2cc1c5c22d7fa0e8f3f3ced14fe338265aa6c8ea5fa4e1f7c' 
  AND token = 'uDa4/poIFjSQ4A2itN0v099r/Bau3vsj2K9mxXY7sjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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