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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b8f58b603feb0d9aaba740b2db8daba58a2f3f6c82de5832aef760857a5d2a' 
  AND token = '32PAZNlr41/hwBVUbyyLKsSgd+jaQacWdXvArblOE0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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