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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8a9fa4917816b4b3dadabc1502c25204949335a8c731775cdc6a1ebcf74aaf' 
  AND token = 'JfveCeGhDYmycPS3GH542/ptS6Ly9gLKjrYYr8pd3t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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