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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8a9c3948c3a5ea1016e7b68d20faf77046168b8644016715be652c0a91c83b' 
  AND token = 'S+8iBmZWV1PQ4Tpcf54NKsMrq/modDOfTrO5LfJdjZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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