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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1438db06dbb2fdaad2bac9cfe0267260f3c9ea8f96997b120a23ab2a42134901' 
  AND token = 'ThABPz2oNsAuLy8Hy1LoZzBXT7c+ewXTmqy4tGqF1ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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