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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efed59bb4a107fe48c4bf230c2dd1b9ce15cafe79c1b928a2484e8af7ea8a952' 
  AND token = 'uOo0ihG6ClIesL9xFB31AOoptHEwISsJTD0wszLfoKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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