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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c805787b8aa5457e392f17546e6b71c903ac507eff7fc765f2ed23203bab0357' 
  AND token = '8Ggsx+v4xFTG+tzOvsfchCVeHWaEu/5/MJrZ7JmRSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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