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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c3cb9ea98ad5deaf3c8cf0698ea7e3d5cba2af386ef4717c9d46ea41909e62' 
  AND token = 'VDm+UTpRoVgtEMBITINbBSWHluejACLqIyU36uwDs0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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