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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f4849c189b9ba7eab4fa2f56a46dac5f17f2a1880991d6a6e3287c043d57a7' 
  AND token = 'UkVMSx4FGrQ8yTPL8OOaDpeWq0FpupYE6f2e/KsDVTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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