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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e306b69465038999067651a8f615e226ad9acd50ea4162c060b9b934e4901d68' 
  AND token = 'tF+41arCX1MTrVVzynPSa4TOPHK1bLmL1GpuUk5dYx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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