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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664b8e74cbbd437462e05bd4ef134435868f18dec6f4ff7d90af42ec218401fa' 
  AND token = 'clXWdLE4Xwqd64yVR686zMrtqpCVxSFeU6UDJ/Ph1YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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