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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6049b8ba9c77f2e4b916c88952b92a76d8527098ecf569ddda49060d86356ebf' 
  AND token = 'evk5cggjTV33Tn3z/IRQ3DXpg5/gqikytfvh//I+9eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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