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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bbbc7a56170ffa104197efe92fcc0aaed98132d83613884f4c7a4172ccef8c' 
  AND token = '5DTVu4r1yV15S7HIyA53wfxSONc2aS1CXka/KGdFO/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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