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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910e6a559db13be616c86b8e19b6132d50de05be002a3d8c57a887182e3e157a' 
  AND token = 'xo0Va90wfNrrQM/QQR9ofXsdcriR8mLZeGnosuMz0Ls=' 
  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"
    }
  }
}