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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876979dae644800be6ff1f1f43eafa758ed1f5bead49427f3aa79aaf67a3f8b3' 
  AND token = 'wdfmuqitZnptj3fIKAhj68fh2R93eagEC6+udk19fmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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