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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e01b52602156a1ea5e487335fa72209e6e472d48a3275f7a79d220f770cd23' 
  AND token = 'HOZVTQRKGf1TzWuv71vqckDOOhMdRBtqxb/p1SpBO60=' 
  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"
    }
  }
}