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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0a7ca2d4d6d702735eb26d1aa36cf9ff68ecd89b855b4d5ef15f79fb9f6678' 
  AND token = 'n+T29nwPDhQneRT8Cu4lz1CHBoYFDa0Hn9MzlSvSoic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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