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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feda800da5c6d10f58d8e2ce074298cb72cda78f6f1cae709befe94ed90cbcfd' 
  AND token = '8N6ETuAxTZRHTsWQqQJKk059mVLdHkW518DhBk7jvAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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