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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7205b98ca2518f8fb1fe949f150a35879a013190f4e992baac7063e40bdfc941' 
  AND token = 'Y94SrRKN6voIdN2t7UfHtmZtxbQpMNvy44+Tm43xP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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