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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b954169e68337b24411a77b594a080d92ebaafe3262e0e4f1a6b0973799196' 
  AND token = 'iihHSCodiyNotOZ2+BIEPWk3JDxC0mWKhV3KPkl7tUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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