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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff97124a1b0609644ea3397a80c1b201378b8a1149a6946863a815ad3517d7cd' 
  AND token = '70UCJopRz0HIksIcbHreLYG4h5VLtAhFrFkO0urK0HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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