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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58de30c626f0592ffdb172785f98049e0af8bfc1e18100bafb3ff8e3ef524acf' 
  AND token = 'xYaYA2kMiYUFSFWZX08RKTWZ7quJpoaT4u+ttqqULD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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