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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9afdace9044a131f649b4ab6b91554dccfd7fd8b1b9986c1d95c2ef677f775' 
  AND token = 'LVAKiRTUOilxgMaaZDYx4AVEPkF1Lm/UFZygLip8jKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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